Noble and Precious Metals - Properties, Nanoscale Effects and Applications最新文献_第2页

Structure-Dependent Biological Response of Noble Metals: From Nanoparticles, Through Nanowires to Nanolayers 贵金属的结构依赖性生物反应:从纳米粒子，通过纳米线到纳米层

Noble and Precious Metals - Properties, Nanoscale Effects and Applications Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.71440

J. Siegel, Marek Staszek, M. Polívková, M. Valova, Pavla Šuláková, V. Svorcik

{"title":"Structure-Dependent Biological Response of Noble Metals: From Nanoparticles, Through Nanowires to Nanolayers","authors":"J. Siegel, Marek Staszek, M. Polívková, M. Valova, Pavla Šuláková, V. Svorcik","doi":"10.5772/INTECHOPEN.71440","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.71440","url":null,"abstract":"Noble metals in their diverse nanoforms bring revolution to many fields of science and technology, as they provide unique properties over their bulk counterparts. Thanks to these completely unprecedented properties, commercial sphere pressure is growing to use them in everyday life. Unfortunately, one of the issues that are subject to dramatic changes is the reactivity of these structures. This may have often fatal consequences to the living organisms. Due to the fact that the mechanism of action of metal nanostructures on living organisms is not yet fully elucidated even in the case of the most studied noble metals such as gold and silver, it is necessary to continue intensively in their research, characterization and categorization. The main prerequisite for the undistorted study of interactions of nanostructures with living organisms is the use of suitable methods of their preparation. Within this context, this chapter attempts to summarize current knowledge form the field of synthesis of metal nanoparticles, layers, wires, and other nanostructures, especially regarding novel techniques of their preparation and extend them by our own results in this area, in the context of their biological properties. More specifically, anti bacterial efficacy and potential cytotoxicity of those structures are thoroughly addressed. one-step of The values of atomic of both, Ag and Pd, the (24.8% The between our and Tumas’ results, originates from the rotation of samples during the analysis. for","PeriodicalId":201297,"journal":{"name":"Noble and Precious Metals - Properties, Nanoscale Effects and Applications","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124210456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Rare Earth Extraction from NdFeB Magnets 从钕铁硼磁体中提取稀土

Noble and Precious Metals - Properties, Nanoscale Effects and Applications Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.70881

J. Kitagawa, M. Tsubota

{"title":"Rare Earth Extraction from NdFeB Magnets","authors":"J. Kitagawa, M. Tsubota","doi":"10.5772/INTECHOPEN.70881","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.70881","url":null,"abstract":"There is a considerable interest in the extraction of rare earths (RE) from NdFeB magnets in order to recycle rare earth elements. Although the wet process using acid is in practical use in the in-plant recycle of sludge, higher selectivity between rare earths and Fe at room temperature is desired. We have recently proposed a pretreatment of corrosion before the hydrochloric acid (HCl) leaching and the oxalic acid precipitation. Almost full recovery of rare earths can be achieved even at room temperature process. In practical extraction methods, employing wet processes, the discharge of waste acid solution is a problem that needs to be solved to reduce the environmental impact. We further present an encouraging demonstration of rare earth extraction from NdFeB magnet using a closed-loop HClbased process. Triple extraction has been conducted, and the recovery ratio of rare earths is approximately 50% in each extraction, which is reduced from almost 100% recovery in a one-shot extraction. Despite the reduced extraction efficiency, our method with a rather small number of procedures at almost room temperature is still highly advantageous in terms of cost and environmental friendliness. This study represents the initial step toward the realization of a closed-loop acid process in the recycling of rare earth elements.","PeriodicalId":201297,"journal":{"name":"Noble and Precious Metals - Properties, Nanoscale Effects and Applications","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127958924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Symbiosis in Plasmonic Nanoparticles 等离子体纳米粒子的共生

Noble and Precious Metals - Properties, Nanoscale Effects and Applications Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.71730

A. Malasi, R. Sachan

引用次数: 0

Effect of Size, Shape and Environment on the Optical Response of Metallic Nanoparticles 尺寸、形状和环境对金属纳米粒子光学响应的影响

Noble and Precious Metals - Properties, Nanoscale Effects and Applications Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.71574

S. Marhaba

引用次数: 12

Substrate Effects of Noble Metal Nanostructures Prepared by Sputtering 溅射制备贵金属纳米结构的衬底效应

Noble and Precious Metals - Properties, Nanoscale Effects and Applications Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.71340

A. Řezníčková, O. Kvítek, D. Fajstavr, N. Slavíková, V. Svorcik

引用次数: 2

Exciton-Plasmon Interactions in Quantum Well Structures Near Silver Nanoparticles 银纳米粒子附近量子阱结构中的激子-等离子体相互作用

Noble and Precious Metals - Properties, Nanoscale Effects and Applications Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.71466

H. Matsui

{"title":"Exciton-Plasmon Interactions in Quantum Well Structures Near Silver Nanoparticles","authors":"H. Matsui","doi":"10.5772/INTECHOPEN.71466","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.71466","url":null,"abstract":"The chapter reports photoluminescence (PL) and an energy transfer dynamic in a hybrid heterostructure consisting of an Ag nanoparticle (NP) layer and Cd 0.08 Zn 0.92 O/ZnO quantum well (QW). The observed PL quenching was closely related to electronic states of excitons confined in the QW. The PL quenching of the QW emission was only observed at low temperatures which excited carriers were radiatively recombined due to excitonic localization derived from fluctuated energy potentials in the QW. In contrast, delocaliza tion of excitons from the QW with increasing temperature resulted in disappearance of the PL quenching. Time-resolved PL measurements revealed a decay rate of PL from the QW emission through the presence of energy transfer from the QW to Ag NP layer. The temperature-dependent energy-transfer rate was similar to that of the radiative recombination rate. The Ag NP layer surface showed a visible light absorption caused by local- ized surface plasmons (LSPs), which was very close to the PL peak energy of the QW. These results indicated that the excitonic recombination energy in the QW was nonra- diatively transferred to Ag NP layer owing to energy resonance between the LSP and the QW. These phenomena could be explained by a surface energy transfer mechanism.","PeriodicalId":201297,"journal":{"name":"Noble and Precious Metals - Properties, Nanoscale Effects and Applications","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125798074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent Developments on Metal Nanoparticles for SERS Applications 金属纳米粒子在SERS中的应用进展

Noble and Precious Metals - Properties, Nanoscale Effects and Applications Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.71573

T. Bora

引用次数: 19

Preparation of Highly Dispersed Pd-Supported Catalysts for Hydrogenation Processes by Microemulsion Method 微乳液法制备高分散pd负载加氢催化剂

Noble and Precious Metals - Properties, Nanoscale Effects and Applications Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.72986

J. Patera, Iva Paterova, J. Krupka, K. Jirátová

引用次数: 0

Structure and Applications of Gold in Nanoporous Form 纳米孔形态金的结构与应用

Noble and Precious Metals - Properties, Nanoscale Effects and Applications Pub Date : 2017-12-20 DOI: 10.5772/INTECHOPEN.71439

Jay K. Bhattarai, Dharmendra Neupane, Bishal Nepal, VasiliiMikhaylov, A. Demchenko, K. Stine

{"title":"Structure and Applications of Gold in Nanoporous Form","authors":"Jay K. Bhattarai, Dharmendra Neupane, Bishal Nepal, VasiliiMikhaylov, A. Demchenko, K. Stine","doi":"10.5772/INTECHOPEN.71439","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.71439","url":null,"abstract":"Nanoporous gold (np-Au) has many interesting and useful properties that make it a material of interest for use in many technological applications. Its biocompatible nature and ability to serve as a support for self-assembled monolayers of alkanethiols and their derivative make it a suitable support for the immobilization of carbohydrates, enzymes, proteins, and DNA. Its chemically inert, physically robust and conductive high-surface area makes it useful for the design of electrochemistry-based chemical/bio-sensors and reactors. Furthermore, it is also used as solid support for organic molecular synthesis and biomolecules separation. Its enhanced optical property has application in design of plasmonics-based sensitive biosensors. In fact, np-Au is one of the few materials that can be used as a transducer for both optical and electrochemical biosensing. Due to the presence of low-coordination surface sites, np-Au shows remarkable catalytic activity for oxidation of molecules like carbon monoxide and methanol. Owing to the importance of np-Au, in this chapter we will highlight different strategies of fabrication of np-Au and its emerging applications based on its unique properties.","PeriodicalId":201297,"journal":{"name":"Noble and Precious Metals - Properties, Nanoscale Effects and Applications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129829219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4